I want to make a call using my GSM modem. So I wrote the below program:
import time
import serial
recipient = "+98xxxxxxxxxx"
phone = serial.Serial("COM10", 115200, timeout=5)
try:
time.sleep(0.5)
phone.write(b'ATZ\r')
time.sleep(1)
phone.write(b'ATD"'+recipient.encode() +b'"\r')
while(1):
print(phone.readline())
time.sleep(0.5)
finally:
phone.close()
But when I run it I receive this output:
>>> ================================ RESTART ================================
>>>
b'ATZ\r\r\n'
b'OK\r\n'
b'ATDxxxxxxxxxx\r\r\n'
b'NO CARRIER\r\n'
What does this "NO CARRIER" error means?
Note that I can send SMS successfully.
This is the program that I use to send SMS:
import time
import serial
recipient = "+98xxxxxxxxxx"
message = "Test"
phone = serial.Serial("COM10", 115200, timeout=5)
try:
time.sleep(0.5)
phone.write(b'ATZ\r')
time.sleep(0.5)
phone.write(b'AT+CMGF=1\r')
time.sleep(0.5)
phone.write(b'AT+CMGS="' + recipient.encode() + b'"\r')
time.sleep(0.5)
phone.write(message.encode() + b"\r")
time.sleep(0.5)
phone.write(bytes([26]))
time.sleep(0.5)
finally:
phone.close()
I found the origin of the error :
The syntax is
ATD+98xxxxxxxxxx;
followed by terminating string. I was forgotten to put semicolon at the end after the number.So I replace
with
And now it works fine.
Based on the brackets in this documents, I thought that using ";" is optional. But it seems that I was wrong.